Carbazolyl-(4)-oxypropanolamine compounds and therapeutic compositions

Carbazolyl-(4)-oxypropanolamine compound of the formula ##STR9## wherein R.sub.1 is hydrogen, lower alkanoyl of up to 6 carbon atoms or aroyl selected from benzoyl and naphthoyl;

• R.sub.2 is hydrogen, lower alkyl of up to 6 carbon atoms or arylalkyl selected from benzyl, phenylethyl and phenylpropyl;
• R.sub.3 is hydrogen or lower alkyl of up to 6 carbon atoms;
• R.sub.4 is hydrogen or lower alkyl of up to 6 carbon atoms, or when X is oxygen, R.sub.4 together with R.sub.5 can represent --CH.sub.2 --O--;
• X is a valency bond, --CH.sub.2, oxygen or sulfur;
• Ar is selected from phenyl, naphthyl, indanyl and tetrahydronaphthyl;
• R.sub.5 and R.sub.6 are individually selected from hydrogen, fluorine, chlorine, bromine, hydroxyl, lower alkyl of up to 6 carbon atoms, a --CONH.sub.2 -- group, lower alkoxy of up to 6 carbon atoms, benzyloxy, lower alkylthio of up to 6 carbon atoms, lower alkylsulphinyl of up to 6 carbon atoms and lower alkylsulphonyl of up to 6 carbon atoms;
• or
• R.sub.5 and R.sub.6 together represent methylenedioxy;
• and the salts thereof with physiologically acceptable acids.